Ithaca is a city and the county seat of Gratiot County, Michigan. It is located very near the geographical center of the state's lower penins…Ithaca is a city and the county seat of Gratiot County, Michigan. It is located very near the geographical center of the state's lower peninsula. The population was 2,853 at the 2020 census. Ithaca is run as a council-manager government. It sits at the conjunction of four townships in the center of the county: Emerson Township to the northeast, Arcada Township to the northwest, Newark Township to the southwest, and North Star Township to the southeast, but is administratively autonomous.
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